Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c62a92ff7a167d3…

MALICIOUS

PDF

76.7 KB Created: 2021-09-17 00:36:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 988706c2b630afc8780f76ea2c5ef943 SHA-1: 1e4d909b5f0c2acee481ce0576ff4f02202e162f SHA-256: 9c62a92ff7a167d3009880ce186867da1d7bce140909606c17090ead5442380d
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to suspicious domains and are structured as link farms, suggesting a phishing or malware distribution attempt. The heuristic 'SE_QR_LURE' also suggests a potential QR code phishing tactic, though this is common in legitimate documents. No scripts were extracted, but the overall structure and URL presence strongly suggest a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://keepingscore.org/userfiles/file/zozasujuv.pdf
    • http://stefani.cz/fck/file/vibazizusavutebig.pdf
    • http://demirlermetal.com/resimler/files/gupimoxipesewezida.pdf
    • http://erfaspot.com/resimler/files/3495636993.pdf
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/51621007697.pdf
    • http://longruiglass.com/ckfinder/userfiles/files/20210905_121014.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4fd439a00---36652728007.pdf
    • https://serihosting.com/calisma2/files/uploads/98804059969.pdf
    • http://purofirstli.com/userfiles/files/jinexibuxu.pdf
    • http://cloverdiamond.com/file/89820808968.pdf
    • http://pc-driver.ru/userfiles/files/38669525413.pdf
    • http://designbyjoseph.com/uploads/File/kotofuwajejamo.pdf
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/f4ip3da5hfhp4q2ha7umssdnp7/laruni.pdf
    • http://ty6600.com/userfiles/file/56277277448.pdf
    • https://okazdedziecko.pl/_files/Media/file/jasuwe.pdf
    • http://www.siscbolivia.com/admin/uploaded/fck/file/58822285279.pdf
    • http://tid.vn/upload/files/22664627356.pdf
    • https://kingwrapcarspa.com/upload/files/botufixeleneneniguro.pdf
    • http://biosystech.com/pdsFck/file/22831018787.pdf
    • http://studiorinaldibedin.eu/userfiles/files/kadaredusux.pdf
    • http://bretagne.annuaire-regional.com/ckfinder/userfiles/files/33713740838.pdf
    • http://dinskayarealty.ru/media/file/demunezalik.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=watch+a+room+with+a+view+online+free
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c868.bin
4fb2e101797682e6593f0282c080ed167bf273c20f0c10ebcf6eec6ec618a23a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC868 10576 bytes
font_01_sfnt_off0000e06a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE06A 16792 bytes
font_02_sfnt_off0000f87c.bin
382d0572b3f44c26d00294e4a8f7ce59a70e7ba862a38bf912d78cf9f7f0e5f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF87C 17408 bytes

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